Still no sign of flipping?

Yuzhe is into his 4.5 months already but he doesn't show any signs of flipping yet. I feedback this to the PD during the 2nd 6-in-1 jab. Initially he raised the need to visit the neurologist for further examination, and I was like "huh .. is there such a need ..?". But later on, he feel should be alright since his limbs and neck coordination looks normal to him. The PD advised we should try to stimulate his interest in flipping by encouraging more tummy time. Sometimes we did try, but the moment we put him on the tummy, he started wailing, perhaps not comfortable in that position.

Maybe by the next month, he should show some good progress :)